I get the following Backup task notification every time the backup of the domain with postgres db runs:
<?xml version="1.0" encoding="UTF-8"?>
<execution-result status="warnings" log-location="/opt/psa/PMM/sessions/2016-12-28-041756.339/migration.result">
<object name="server" type="server">
<object type="domain" name="domain.de" uuid="domain#domain.de">
<object type="postgresql" name="rss">
<message code="msgtext" id="c8defd93-d5d3-49fa-81bd-c9850493b7dd" severity="warning">
<description>Failed to execute backup database</description>
</message>
<message severity="warning" id="b11114fc-f2e1-4ca2-80e8-69512ef563ff" code="msgtext">
<description>Not all the data was backed up into /var/lib/psa/dumps/domains/domain.de/databases/rss_2 successfully. /usr/lib/postgresql/9.5/bin/pg_dump: invalid option -- 'i'
Try "pg_dump --help" for more information.
</description>
</message>
</object>
</object>
</object>
</execution-result>
<?xml version="1.0" encoding="UTF-8"?>
<execution-result status="warnings" log-location="/opt/psa/PMM/sessions/2016-12-28-041756.339/migration.result">
<object name="server" type="server">
<object type="domain" name="domain.de" uuid="domain#domain.de">
<object type="postgresql" name="rss">
<message code="msgtext" id="c8defd93-d5d3-49fa-81bd-c9850493b7dd" severity="warning">
<description>Failed to execute backup database</description>
</message>
<message severity="warning" id="b11114fc-f2e1-4ca2-80e8-69512ef563ff" code="msgtext">
<description>Not all the data was backed up into /var/lib/psa/dumps/domains/domain.de/databases/rss_2 successfully. /usr/lib/postgresql/9.5/bin/pg_dump: invalid option -- 'i'
Try "pg_dump --help" for more information.
</description>
</message>
</object>
</object>
</object>
</execution-result>